<?php

/*
 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
 * Copyright (C) 2006-2009 Dan Fuhry
 *
 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
 */

/**
 * Class for formatting and displaying tag clouds. Loosely based the reference cloud engine from <http://www.lotsofcode.com/php/tutorials/tag-cloud>.
 * @package Enano
 * @subpackage Presentation/UI
 * @copyright (C) 2007 Dan Fuhry
 * @license GNU General Public License, version 2 or at your option any later versionc
 */

class TagCloud
{
	
	/**
 	* The list of words in the cloud.
 	* @var array
 	*/
	
	var $words = array();
	
	/**
 	* Constructor.
 	* @param array Optional. An initial list of words, just a plain old array.
 	*/
	
	function __construct($words = array())
	{
		if ( count($words) > 0 )
		{
			foreach ( $words as $word )
				$this->add_word($word);
		}
	}
	
	/**
 	* Adds a word into the word list.
 	* @param string The word to add
 	*/
	
	function add_word($word)
	{
		$word = sanitize_tag($word);
		
		if ( isset($this->words[$word]) )
			$this->words[$word] += 1;
		else
			$this->words[$word] = 1;
	}
	
	/**
 	* Returns the total size of the cloud.
 	* @return int
 	*/
	
	function get_cloud_size()
	{
		return array_sum($this->words);
	}
	
	/**
 	* Shuffles the cloud.
 	*/
	
	function shuffle_cloud()
	{
		$keys = array_keys($this->words);
		if ( !$keys || empty($keys) || !is_array($keys) )
			return null;
		
		shuffle($keys);
		if ( !$keys || empty($keys) || !is_array($keys) )
			return null;
		
		$temp = $this->words;
		$this->words = array();
		foreach ( $keys as $word )
		{
			$this->words[$word] = $temp[$word];
		}
		
		unset($temp);
	}
	
	/**
 	* Returns the popularity index (scale class) for a 1-100 number.
 	* @param int
 	* @return int
 	*/
	
	function get_scale_class($val)
	{
		$ret = 0;
		if ( $val >= 99 )
			$ret = 1;
		else if ( $val >= 70 )
			$ret = 2;
		else if ( $val >= 60 )
			$ret = 3;
		else if ( $val >= 50 )
			$ret = 4;
		else if ( $val >= 40 )
			$ret = 5;
		else if ( $val >= 30 )
			$ret = 6;
		else if ( $val >= 20 )
			$ret = 7;
		else if ( $val >= 10 )
			$ret = 8;
		else if ( $val >= 5 )
			$ret = 9;
		return $ret;
	}
	
	/**
 	* Generates and returns HTML for the cloud.
 	* @param string Optional. The CSS class applied to all <span> tags. Can be "normal" or "small". Defaults to "normal".
 	* @param string Optional. The alignment for the div. Defaults to "center".
 	* @return string
 	*/
 	
	function make_html($span_class = 'normal', $div_align = 'center')
	{
		global $lang;
		$html = array();
		$max  = max($this->words);
		$size = $this->get_cloud_size();
		$inc = 0;
		if ( count($this->words) > 0 )
		{
			foreach ( $this->words as $word => $popularity )
			{
				$inc++;
				$word = htmlspecialchars($word);
				$percent = ( $popularity / $max ) * 100;
				$index = $this->get_scale_class($percent);
				$newline = ( $inc == 5 ) ? "<br />" : '';
				( $inc == 5 ) ? $inc = 0 : null;
				$url = makeUrlNS('Special', 'TagCloud/' . htmlspecialchars($word));
				$popstring = ( $popularity == 1 ) ? $lang->get('pagetools_tagcloud_tip_popularity_one') : $lang->get('pagetools_tagcloud_tip_popularity_plural', array('popularity' => $popularity));
				$html[] = "<span class='tc_word_{$span_class} tc_{$span_class}_index_{$index}'><a href='$url' title='$popstring'>$word</a></span>"; // $newline";
			}
		}
		$html = '<div style="text-align: ' . $div_align . '; margin: 0 auto; max-width: 400px;">' . implode("\n", $html) . '</div>';
		return $html;
	}
 	
	
}

?>
